Plinky Full DIY Kit

From: £150.00 (Excl. VAT)

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Plinky is a powerful 8 voice polyphonic touch synth that specialises in melancholic sounds to lose yourself in. This dream box puts expressive modulation of CS-80 style sounds and lush FX straight into your hands. 

The kit contains everything you need to build either a standalone desktop mini-synth (powered from USB Micro B cable, not included), or a 24HP eurorack module (you need +5V on your busboard).

Mutable 'Volts' +5V supply (Not required for Standalone USB power)

If your Eurorack busboard doesn't have a +5V supply you need to tick the box.

Out of stock

SMD Tweezers

You need these for all the SMD LEDs, tick the box.

Out of stock

Out of Stock

Description

Plinky churns out warm-yet-fragile, CS80-meets-the-finest-finnish-melodic-electronica sounds. Every finger press is interpreted by old-school analog capacitive touch plates, polyphonically modulating the digital sound with analog sensitivity. Its lush built in reverb & capable arpeggiator mean you can lose hours to just noodling around – with no other gear than a pair of headphones and a USB power pack. Its intense modulation possibilities (full 90×7 mod matrix! 90 sample and holds per voice!) and eurorack connectivity mean it’s as deep as it is fun. 

Important Notes

  • Plinky has all the hardcore SMD parts pre-soldered, you do need to solder the SMD LEDS on the panel but these are pretty easy with SMD Tweezers.
  • Plinky needs +5v on your Eurorack bus to be powered, if you don’t have 5V on your busboard then buy one of these too.
  • Plinky comes ready flashed with software! Just solder and start playing straight away without involving a computer.

Back-panel and spacers for standalone use included with kit (as shown below).

 

Custom machined aluminium case available separately in January 2021 for approx £50 (Excl. VAT)

When standalone, Plinky is powered from a USB Micro B socket, with line level audio in, and headphone out on both top and bottom edges of the unit. 

Or, just unscrew it from its back plate and place it in your eurorack case, with built-in eurorack power connector and 16 CV patch points. Please note that plinky requires a 5v supply from your eurorack case.

Plinky is a relatively easy build, with the main SMD circuit board pre-assembled. The 72 SMD LEDs in the front panel require assembly with tweezers.

Some basic soldering experience is recommended, however it makes a good easy introduction to SMD assembly. Detailed build videos complement the build guide, available at plinkysynth.com/build. I’d recommend it to anyone who successfully built any ‘easy’ kit from thonk, ie it makes a good ‘second’ soldering project.

You will need a soldering iron, solder, fine tweezers, and a USB-B micro power cable (as used by most Android phones, Kindles, etc). Everything else is included.

The Story of Plinky

Plinky grew out of an experiment to use a distinctly analogue ‘touch’ technology, to control a stack of 32 digital sawtooth oscillators. Together with built-in reverb and delay, the imperfections in the analog touch data are turned into an advantage, by detuning the unison oscillators in a way that makes you feel really ‘connected’ to the sound. This combination of physical expressiveness and digital sound generation is what makes plinky a unique yet fun instrument.

The 8 voices are mapped directly to the 8 vertical columns of the touch plate. Think of it almost like 8 monosynths, stacked from left to right, with each controlled by the pressure and position of your finger in each column. 

Plinky gives you a choice of 4×8 sawtooth oscillators, 2×8 ROM wavetable oscs, or 4×8 granular samplers using samples that you can record into its 32MB sample memory.

It also adds a per-voice noise source, two ADSR envelopes per voice, a global overdrive and reverb and delay units.

The pressure of each finger is mapped to the cutoff of a dedicated 2 pole resonant low-pass gate per voice, giving real-time control over the timbre of each voice.

It can also be used as an FX unit to process live audio, or as a sequencer or arpeggiator to drive other eurorack voices using its 1 V/Oct pitch outputs.

Unlike a raw oscillator, plinky expects to be played (either live, or via its built-in sequencer). However it has CV inputs for both pitch and gate, which allow it to be transposed and gated, as part of a larger modular patch. By switching on the latch and sustaining a single note, you could use it as a voice, arpeggiator, FX unit, sequencer, or any combination of those.

As well as the two envelopes per voice, it has 4 LFOs, a powerful arpeggiator and 64 step sequencer, with many parameters including euclidean rhythms. It has non-volatile storage built in, for 24 patterns, 32 presets and 8 sample slots of 1 minute each. Each sample can be time-stretched, pitched, and sliced into 8 pieces, including ‘key-split’ multi-sample playback. 

Even when used standalone, it integrates with modular synths with its 8 CV inputs and 8 CV outputs, including clock, pitch, gates and triggers.

Two ‘performance knobs’ act as macro controls (offsetting the A and B CV inputs), that can be arbitrarily routed to morph any number of parameters.

A third ‘encoder’ knob makes it easy to make fine adjustments while playing. In the performance below, the left knob is mapped to overdrive and the right knob controls the number of octaves the arpeggiator uses:

Each patch can use the knobs any way it likes. 

It supports midi in (notes, CC, pitch bend, polyphonic aftertouch, clock) over USB, and will expand its MIDI features in the future with firmware updates.

The module is less than 20mm deep. The kit includes spacers, a back plate and rubber feet, so that it can be used ‘stand alone’. A beautiful custom machined black aluminium case will be available in January 2021.

A full build guide is available at plinkysynth.com/build, along with detailed build videos and support links if you need help with your build.

The manual and example videos are at plinkysynth.com/play. Regular firmware updates and new demo videos will be added there over time. Plinky has a slight learning curve – especially to unlock the power of the modulation matrix – but once you have a patch dialled in, you can just enjoy playing notes across the whole surface.

The kit arrives pre-flashed and with CV inputs pre-calibrated, however flashing plinky with the latest firmware is easy using a USB cable and any computer that supports USB memory sticks. It is recommended to update plinky to the latest firmware, available from plinkysynth.com/fw

TECH SPECS

24HP eurorack module / standalone synth (interchangeable)

Synthesis engines: 

  • 8 voices made up of a choice of:
  • 32x polyblep bandlimited digital sawtooth oscillators; 
  • 16x PWM bandlimited digital square/pulse oscillators; 
  • 16x ROM wavetable oscs;
  • 32x granular sample playback from user sample non-volatile RAM
  • plus this per voice:
  • Low pass gate (2 pole resonant)
  • White noise generator
  • 2x ADSR envelope generators

plus this globally:

  • Stereo Reverb with shimmer
  • Two tap Delay with stereo ping-pong
  • Overdrive
  • High-pass filter (2 pole)
  • 4 LFOs with many shapes & controllable symmetry

Sequencing:

  • 64 step sequencer with euclidean rhythms
  • Arpeggiator with euclidean rhythms

Memory (non-volatile)

  • 32 ‘preset’ slots storing all parameters & modulation settings
  • 24 64-step patterns
  • 8 sample slots (mono 32khz; max 65 seconds each); 32Mb total

Size / Case 

  • 24HP (122mm x 128mm); 20mm maximum depth
  • Fiberglass back plate for standalone use; eurorack mounting holes.
  • Aluminium case option sold separately in 2021

Power:

  • EITHER 16 Pin Eurorack power header. Cable included. 
  • OR USB-B micro power. Cable not included. 

5V POWER IS REQUIRED FROM YOUR EURORACK CASE

DO NOT PLUG USB AND EURORACK IN AT THE SAME TIME

  • 150mA from 5v / USB
  • 10mA from +12v and -12v when powered from eurorack

Standalone ports at both top and bottom edge:

  • USB-B micro for power/usb midi/software update
  • Line-level audio in 
  • Headphone/Line audio output

CV Inputs:

  • Clock (16th note)
  • Gate (0-5v)
  • Pitch (-2v to 5v, 1V/Oct)
  • 4 Modulation inputs (A,B,X,Y, -5v to 5v)
  • Mono Audio in (10v p2p) – for live FX processing & sampling usage.

CV Outputs:

  • Mono/Stereo audio out (10v p2p), 
  • Clock (16th note), 
  • Trigger (>5v), 
  • Analog Gate & Pressure (0-5v), 
  • Two pitch outputs (lowest and highest notes being played) (-2v to 5v, 1V/Oct) 

USB: 

  • USB Midi input (notes, CC, pitch bend, polyphonic aftertouch, clock). responds on all channels.
  • Firmware upgrade, and preset backup/exchange over USB Mass storage device via special ‘flashing’ mode (UF2 format)

Sample Rate: 32khz, 16-bit